SAFRICA-HEALTH-POLITICS-MANDELA

ODD ANDERSEN / AFP/Getty Images

Pebble stones with get well messages for former South African President Nelson Mandela are seen outside his home in Johannesburg on June 29, 2013. US President Barack Obama met the family of his critically ill hero Nelson Mandela on a visit to South Africa Saturday, the White House said.The president, whose landmark trip to Africa has been overshadowed by Mandela's illness, decided not to visit the ailing icon, instead meeting family members at the Mandela Centre of Memory in Johannesburg. AFP PHOTO / ODD ANDERSENODD ANDERSEN/AFP/Getty Images ORG XMIT:

Pebble stones with get well messages for former South African President Nelson Mandela are seen outside his home in Johannesburg on June 29, 2013. US President Barack Obama met the family of his critically ill hero Nelson Mandela on a visit to South Africa Saturday, the White House said.The president, whose landmark trip to Africa has been overshadowed by Mandela's illness, decided not to visit the ailing icon, instead meeting family members at the Mandela Centre of Memory in Johannesburg. AFP PHOTO / ODD ANDERSENODD ANDERSEN/AFP/Getty Images ORG XMIT: (ODD ANDERSEN / AFP/Getty Images)

Pebble stones with get well messages for former South African President Nelson Mandela are seen outside his home in Johannesburg on June 29, 2013. US President Barack Obama met the family of his critically ill hero Nelson Mandela on a visit to South Africa Saturday, the White House said.The president, whose landmark trip to Africa has been overshadowed by Mandela's illness, decided not to visit the ailing icon, instead meeting family members at the Mandela Centre of Memory in Johannesburg. AFP PHOTO / ODD ANDERSENODD ANDERSEN/AFP/Getty Images ORG XMIT: